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reactor.c
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reactor.c
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#include <internal.h>
#include <uv.h>
#include "gc.h"
#include "sugar.h"
#include "reactor.h"
#include "modules/fs.h"
#include "modules/timer.h"
#include "modules/fetch.h"
#include "modules/child_process.h"
#include "modules/readline.h"
#include "modules/process.h"
void js_poll_events(ant_t *js) {
coros_this_tick = 0;
fetch_poll_events();
fs_poll_events();
child_process_poll_events();
process_immediates(js);
process_microtasks(js);
for (coroutine_t *temp = pending_coroutines.head, *next; temp; temp = next) {
next = temp->next;
if (!temp->is_ready || !temp->mco || mco_status(temp->mco) != MCO_SUSPENDED) continue;
remove_coroutine(temp);
coro_saved_state_t saved = coro_enter(temp->js, temp);
mco_result res = mco_resume(temp->mco);
coro_leave(temp->js, temp, saved);
if (res == MCO_SUCCESS && mco_status(temp->mco) != MCO_DEAD) {
temp->is_ready = false;
enqueue_coroutine(temp);
} else free_coroutine(temp);
}
if (js->needs_gc && !js->gc_suppress) {
js->needs_gc = false;
js_gc_compact(js);
js->gc_alloc_since = 0;
}
}
static inline work_flags_t get_pending_work(void) {
work_flags_t flags = 0;
if (has_pending_microtasks()) flags |= WORK_MICROTASKS;
if (has_pending_timers()) flags |= WORK_TIMERS;
if (has_pending_immediates()) flags |= WORK_IMMEDIATES;
if (has_pending_coroutines()) flags |= WORK_COROUTINES;
if (has_ready_coroutines()) flags |= WORK_COROUTINES_READY;
if (has_pending_fetches()) flags |= WORK_FETCHES;
if (has_pending_fs_ops()) flags |= WORK_FS_OPS;
if (has_pending_child_processes()) flags |= WORK_CHILD_PROCS;
if (has_active_readline_interfaces()) flags |= WORK_READLINE;
if (has_active_stdin()) flags |= WORK_STDIN;
return flags;
}
static void maybe_gc(ant_t *js) {
jsoff_t thresh = js->brk / 2;
if (thresh < 4 * 1024 * 1024) thresh = 4 * 1024 * 1024;
if (js->gc_alloc_since > thresh || js->needs_gc) {
js->needs_gc = false;
js_gc_compact(js);
js->gc_alloc_since = 0;
}
}
void js_run_event_loop(ant_t *js) {
work_flags_t work;
js->gc_suppress = false;
while ((work = get_pending_work()) & WORK_PENDING) {
js_poll_events(js);
work = get_pending_work();
if (work & WORK_BLOCKING) uv_run(uv_default_loop(), UV_RUN_NOWAIT);
else if (work & WORK_ASYNC) { maybe_gc(js); uv_run(uv_default_loop(), UV_RUN_ONCE); }
else if (work & WORK_COROUTINES) break;
}
js_poll_events(js);
}

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